Solder-hemmed cap.



E. LANG, JR. SOLDER HEMMED CAP.

APPLICATION FILED MAY 8,1909.

94%582fl Patented Feb. 15, 1910.

EDWARD lVL LANG, JR., OF PORTLAND, MAINE.

SOLDER-HEMMED CAP.

Specification of Letters Patent.

Application filed May 8, 1909.

Patented Feb. 15, 1910.

Serial No. 494,921.

To all whom it may concern.

Be it known that I, EDWARD M. LANG, Jr., a citizen of the United States,residing at Portland, in the county of Cumberland and State of Maine,have invented certain new and useful Improvements in Solder- HemmedCaps; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the artto which it appertains to make and use the same.

My invention relates to caps or studs used for the closing of metal canscontaining hermetically sealed goods, and especially to that class ofcaps or studs which are hemmed with solder, this application being aspecific improvement upon my former patent No. 867,388, dated October 1,1907.

My invention consists in nurling the entire surface of a hem of solderupon a cap.

In the accompanying drawings-Figure l is a bottom plan view of the cap.Fig. 2 is a top plan view of the same. Fig. 3 is a perspective view on alarger scale of a part of the cap turned bottom upward, showing the hem,and Fig. 4: is a plan view of a part of a hem as flattened out.

(4 represents a can cap of the ordinary shape provided with a hem ofsolder Z), which is knurled on both sides as shown in the drawing.

In my previous patent No. 867,383, I showed a hemmed can cap with thehem knurled on the underside, but I have found in practice that betterresults are obtained by nurling the hem over the entire surface. 1

The advantages of the improved cap are that during the initial stages ofthe soldering process, the nurling or roughening of the lower surface ofthe hem keeps the cap in place on the stud of the can; and also in thefact that the indentations or grooves on the lower surface of the hempermit the gases formed by the heat in the initial stages of thesoldering process to readily escape; and furthermore that by nurling theupper surface of the hem the melting of the hem is effected much morequickly, as the hot soldering iron comes in contact first with theelevated portions and there is an opportunity for the gases to escapethrough the grooves. The knurled surface presents a better and morefinished product than the present hemmed caps on the market to-day.Furthermore, this surface has a tendency to hold the small particles offlux in the proper position on the top side of the knurled hem whenapplied with a brush.

I claim 1. A cap having a continuous hem of solder knurled both on theupper and under sides, substantially as described.

'2. As a new article of manufacture, a cap the edge of which is providedwith a continuous hem of solder, said hem being knurled over its entireouter surface, substantially as described.

In testimony whereof, I affiX my signature, in presence of twowitnesses.

EDWARD M. LANG, JR.

\Vitnesses K. M. TWIGG, ALDEN STRONG.

